Accession Number : ADA257764


Title :   Models of Ionospheric Release Experiments. Part 1: SF sub 6 Releases; Part 2: CO sub 2 Releases


Descriptive Note : Scientific rept. no. 1


Corporate Author : MISSION RESEARCH CORP NASHUA NH


Personal Author(s) : Eccles, J V ; Armstrong, Russell A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257764.pdf


Report Date : Aug 1991


Pagination or Media Count : 146


Abstract : High-altitude chemical releases are investigated with the use of several numerical models of chemistry, dynamics, and electrodynamics. The specific releases investigated were SF sub 6 and CO sub 2 in the F-region of the ionosphere. The chemistry for reproducing observations from the CRRES-at- Kwajalein SF sub 6 release must include oxidation reactions of ions and neutrals. The dominant negative ion observed, F(-), was modeled well with SF(-) sub 5 + O yields SOF sub 4 + F(-) as the dominant production mechanism. SOF(-) sub 3 is potentially an important negative ion resulting from electron attachment of SOF sub 4. The electrodynamic model of the SF sub 6 release did not produce a plasma depletion plume as was hoped. The electrodynamic perturbation is small and short-lived. It will not produce large-scale plume structure associated with equatorial spread-F. The modeling of CO sub 2 releases produced too much 6300A airglow when compared with REDAIR experimental results. The conflict between simulation and experiment requires reduction of CO sub 2 + O(+) reaction rates or inclusion of a CO sub 2 removal mechanism such as freezing. Modeling also shows that the two CO sub 2 releases of the REDAIR experiment may have spatially mixed airglow signatures.


Descriptors :   *IONOSPHERIC MODELS , *IONOSPHERIC CHEMISTRY , MATHEMATICAL MODELS , IONOSPHERE , IONS , RADIATION , MAGNETIC FIELDS , MODELS , DYNAMICS , ELECTRON DENSITY , ELECTRIC FIELDS , CHEMISTRY , ELECTRONS , OXIDATION , CHEMICAL REACTIONS , SIGNATURES , PERTURBATIONS , PLUMES , CARBON DIOXIDE , F REGION , AIRGLOW , UPPER ATMOSPHERE , RADIATION EFFECTS , EARTH ATMOSPHERE , ELECTRODYNAMICS , SCIENTIFIC SATELLITES


Subject Categories : Atmospheric Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE